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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/combine-4.6.6/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../combine/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../combine/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="doccomment">//! This crate contains parser combinators, roughly based on the Haskell libraries
 //! [parsec](http://hackage.haskell.org/package/parsec) and
 //! [attoparsec](https://hackage.haskell.org/package/attoparsec).
 //!
 //! A parser in this library can be described as a function which takes some input and if it
 //! is successful, returns a value together with the remaining input.
 //! A parser combinator is a function which takes one or more parsers and returns a new parser.
 //! For instance the [`many`] parser can be used to convert a parser for single digits into one that
 //! parses multiple digits. By modeling parsers in this way it becomes easy to compose complex
 //! parsers in an almost declarative way.
 //!
 //! # Overview
 //!
 //! `combine` limits itself to creating [LL(1) parsers](https://en.wikipedia.org/wiki/LL_parser)
 //! (it is possible to opt-in to LL(k) parsing using the [`attempt`] combinator) which makes the
 //! parsers easy to reason about in both function and performance while sacrificing
 //! some generality. In addition to you being able to reason better about the parsers you
 //! construct `combine` the library also takes the knowledge of being an LL parser and uses it to
 //! automatically construct good error messages.
 //!
 //! ```rust
 //! extern crate combine;
 //! use combine::{Parser, EasyParser};
 //! use combine::stream::position;
 //! use combine::parser::char::{digit, letter};
 //! const MSG: &amp;&#39;static str = r#&quot;Parse error at line: 1, column: 1
 //! Unexpected `|`
 //! Expected digit or letter
 //! &quot;#;
 //!
 //! fn main() {
 //!     // Wrapping a `&amp;str` with `State` provides automatic line and column tracking. If `State`
 //!     // was not used the positions would instead only be pointers into the `&amp;str`
 //!     if let Err(err) = digit().or(letter()).easy_parse(position::Stream::new(&quot;|&quot;)) {
 //!         assert_eq!(MSG, format!(&quot;{}&quot;, err));
 //!     }
 //! }
 //! ```
 //!
 //! This library is currently split into a few core modules:
 //!
 //! * [`parser`][mod parser] is where you will find all the parsers that combine provides. It contains the core
 //! [`Parser`] trait as well as several submodules such as `sequence` or `choice` which each
 //! contain several parsers aimed at a specific niche.
 //!
 //! * [`stream`] contains the second most important trait next to [`Parser`]. Streams represent the
 //! data source which is being parsed such as `&amp;[u8]`, `&amp;str` or iterators.
 //!
 //! * [`easy`] contains combine&#39;s default &quot;easy&quot; error and stream handling. If you use the
 //! `easy_parse` method to start your parsing these are the types that are used.
 //!
 //! * [`error`] contains the types and traits that make up combine&#39;s error handling. Unless you
 //! need to customize the errors your parsers return you should not need to use this module much.
 //!
 //!
 //! # Examples
 //!
 //! ```
 //! extern crate combine;
 //! use combine::parser::char::{spaces, digit, char};
 //! use combine::{many1, sep_by, Parser, EasyParser};
 //! use combine::stream::easy;
 //!
 //! fn main() {
 //!     //Parse spaces first and use the with method to only keep the result of the next parser
 //!     let integer = spaces()
 //!         //parse a string of digits into an i32
 //!         .with(many1(digit()).map(|string: String| string.parse::&lt;i32&gt;().unwrap()));
 //!
 //!     //Parse integers separated by commas, skipping whitespace
 //!     let mut integer_list = sep_by(integer, spaces().skip(char(&#39;,&#39;)));
 //!
 //!     //Call parse with the input to execute the parser
 //!     let input = &quot;1234, 45,78&quot;;
 //!     let result: Result&lt;(Vec&lt;i32&gt;, &amp;str), easy::ParseError&lt;&amp;str&gt;&gt; =
 //!         integer_list.easy_parse(input);
 //!     match result {
 //!         Ok((value, _remaining_input)) =&gt; println!(&quot;{:?}&quot;, value),
 //!         Err(err) =&gt; println!(&quot;{}&quot;, err)
 //!     }
 //! }
 //! ```
 //!
 //! If we need a parser that is mutually recursive or if we want to export a reusable parser the
 //! [`parser!`] macro can be used. In effect it makes it possible to return a parser without naming
 //! the type of the parser (which can be very large due to combine&#39;s trait based approach). While
 //! it is possible to do avoid naming the type without the macro those solutions require either allocation
 //! (`Box&lt;dyn Parser&lt; Input, Output = O, PartialState = P&gt;&gt;`) or nightly rust via `impl Trait`. The
 //! macro thus threads the needle and makes it possible to have non-allocating, anonymous parsers
 //! on stable rust.
 //!
 //! ```
 //! #[macro_use]
 //! extern crate combine;
 //! use combine::parser::char::{char, letter, spaces};
 //! use combine::{between, choice, many1, parser, sep_by, Parser, EasyParser};
 //! use combine::error::{ParseError, StdParseResult};
 //! use combine::stream::{Stream, Positioned};
 //! use combine::stream::position;
 //!
 //! #[derive(Debug, PartialEq)]
 //! pub enum Expr {
 //!     Id(String),
 //!     Array(Vec&lt;Expr&gt;),
 //!     Pair(Box&lt;Expr&gt;, Box&lt;Expr&gt;)
 //! }
 //!
 //! // `impl Parser` can be used to create reusable parsers with zero overhead
 //! fn expr_&lt;Input&gt;() -&gt; impl Parser&lt; Input, Output = Expr&gt;
 //!     where Input: Stream&lt;Token = char&gt;,
 //!           // Necessary due to rust-lang/rust#24159
 //!           Input::Error: ParseError&lt;Input::Token, Input::Range, Input::Position&gt;,
 //! {
 //!     let word = many1(letter());
 //!
 //!     // A parser which skips past whitespace.
 //!     // Since we aren&#39;t interested in knowing that our expression parser
 //!     // could have accepted additional whitespace between the tokens we also silence the error.
 //!     let skip_spaces = || spaces().silent();
 //!
 //!     //Creates a parser which parses a char and skips any trailing whitespace
 //!     let lex_char = |c| char(c).skip(skip_spaces());
 //!
 //!     let comma_list = sep_by(expr(), lex_char(&#39;,&#39;));
 //!     let array = between(lex_char(&#39;[&#39;), lex_char(&#39;]&#39;), comma_list);
 //!
 //!     //We can use tuples to run several parsers in sequence
 //!     //The resulting type is a tuple containing each parsers output
 //!     let pair = (lex_char(&#39;(&#39;),
 //!                 expr(),
 //!                 lex_char(&#39;,&#39;),
 //!                 expr(),
 //!                 lex_char(&#39;)&#39;))
 //!                    .map(|t| Expr::Pair(Box::new(t.1), Box::new(t.3)));
 //!
 //!     choice((
 //!         word.map(Expr::Id),
 //!         array.map(Expr::Array),
 //!         pair,
 //!     ))
 //!         .skip(skip_spaces())
 //! }
 //!
 //! // As this expression parser needs to be able to call itself recursively `impl Parser` can&#39;t
 //! // be used on its own as that would cause an infinitely large type. We can avoid this by using
 //! // the `parser!` macro which erases the inner type and the size of that type entirely which
 //! // lets it be used recursively.
 //! //
 //! // (This macro does not use `impl Trait` which means it can be used in rust &lt; 1.26 as well to
 //! // emulate `impl Parser`)
 //! parser!{
 //!     fn expr[Input]()(Input) -&gt; Expr
 //!     where [Input: Stream&lt;Token = char&gt;]
 //!     {
 //!         expr_()
 //!     }
 //! }
 //!
 //! fn main() {
 //!     let result = expr()
 //!         .parse(&quot;[[], (hello, world), [rust]]&quot;);
 //!     let expr = Expr::Array(vec![
 //!           Expr::Array(Vec::new())
 //!         , Expr::Pair(Box::new(Expr::Id(&quot;hello&quot;.to_string())),
 //!                      Box::new(Expr::Id(&quot;world&quot;.to_string())))
 //!         , Expr::Array(vec![Expr::Id(&quot;rust&quot;.to_string())])
 //!     ]);
 //!     assert_eq!(result, Ok((expr, &quot;&quot;)));
 //! }
 //! ```
 //!
 //! [`combinator`]: combinator/index.html
 //! [mod parser]: parser/index.html
 //! [`easy`]: easy/index.html
 //! [`error`]: error/index.html
 //! [`char`]: parser/char/index.html
 //! [`byte`]: parser/byte/index.html
 //! [`range`]: parser/range/index.html
 //! [`many`]: parser/repeat/fn.many.html
 //! [`attempt`]: parser/combinator/fn.attempt.html
 //! [`satisfy`]: parser/token/fn.satisfy.html
 //! [`or`]: parser/trait.Parser.html#method.or
 //! [`Stream`]: stream/trait.Stream.html
 //! [`RangeStream`]: stream/trait.RangeStream.html
 //! [`Parser`]: parser/trait.Parser.html
 //! [fn parser]: parser/function/fn.parser.html
 //! [`parser!`]: macro.parser.html
 </span><span class="comment">// inline is only used on trivial functions returning parsers
 </span><span class="attribute">#![allow(
     clippy::inline_always,
     clippy::type_complexity,
     clippy::too_many_arguments,
     clippy::match_like_matches_macro
 )]
 #![cfg_attr(not(feature = <span class="string">&quot;std&quot;</span>), no_std)]
 #![cfg_attr(docsrs, feature(doc_cfg))]

 #[cfg(feature = <span class="string">&quot;alloc&quot;</span>)]
 </span><span class="kw">extern crate </span>alloc;

 <span class="attribute">#[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::error::{ParseError, ParseResult, StdParseResult};

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 #[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::parser::EasyParser;

 <span class="attribute">#[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::parser::Parser;

 <span class="attribute">#[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::stream::{Positioned, RangeStream, RangeStreamOnce, Stream, StreamOnce};

 <span class="attribute">#[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::parser::{
     choice::optional,
     combinator::{attempt, look_ahead, not_followed_by},
     error::{unexpected, unexpected_any},
     function::parser,
     repeat::{
         chainl1, chainr1, count, count_min_max, many, many1, sep_by, sep_by1, sep_end_by,
         sep_end_by1, skip_count, skip_count_min_max, skip_many, skip_many1,
     },
     sequence::between,
     token::{
         any, eof, none_of, one_of, position, produce, satisfy, satisfy_map, token, tokens, value,
     },
 };

 <span class="attribute">#[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::parser::choice::choice;

 <span class="attribute">#[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::parser::combinator::from_str;

 <span class="attribute">#[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::parser::token::tokens_cmp;

 <span class="doccomment">/// Declares a named parser which can easily be reused.
 ///
 /// The expression which creates the parser should have no side effects as it may be called
 /// multiple times even during a single parse attempt.
 ///
 /// NOTE: If you are using rust nightly you can use `impl Trait` instead. See the [json parser][] for
 /// an example.
 ///
 /// [json parser]:https://github.com/Marwes/combine/blob/master/benches/json.rs
 ///
 /// ```
 /// #[macro_use]
 /// extern crate combine;
 /// use combine::parser::char::digit;
 /// use combine::{any, choice, from_str, many1, Parser, EasyParser, Stream};
 /// use combine::error::ParseError;
 ///
 /// parser!{
 ///     /// `[Input]` represents a normal type parameters and lifetime declaration for the function
 ///     /// It gets expanded to `&lt;Input&gt;`
 ///     fn integer[Input]()(Input) -&gt; i32
 ///     where [
 ///         Input: Stream&lt;Token = char&gt;,
 ///         Input::Error: ParseError&lt;char, Input::Range, Input::Position&gt;,
 ///         &lt;Input::Error as ParseError&lt;Input::Token, Input::Range, Input::Position&gt;&gt;::StreamError:
 ///             From&lt;::std::num::ParseIntError&gt;,
 ///     ]
 ///     {
 ///         // The body must be a block body ( `{ &lt;block body&gt; }`) which ends with an expression
 ///         // which evaluates to a parser
 ///         from_str(many1::&lt;String, _, _&gt;(digit()))
 ///     }
 /// }
 ///
 /// #[derive(Debug, PartialEq)]
 /// pub enum IntOrString {
 ///     Int(i32),
 ///     String(String),
 /// }
 /// // prefix with `pub` to declare a public parser
 /// parser!{
 ///     // Documentation comments works as well
 ///
 ///     /// Parses an integer or a string (any characters)
 ///     pub fn integer_or_string[Input]()(Input) -&gt; IntOrString
 ///     where [
 ///         Input: Stream&lt;Token = char&gt;,
 ///         Input::Error: ParseError&lt;char, Input::Range, Input::Position&gt;,
 ///         &lt;Input::Error as ParseError&lt;Input::Token, Input::Range, Input::Position&gt;&gt;::StreamError:
 ///             From&lt;::std::num::ParseIntError&gt;,
 ///     ]
 ///     {
 ///         choice!(
 ///             integer().map(IntOrString::Int),
 ///             many1(any()).map(IntOrString::String)
 ///         )
 ///     }
 /// }
 ///
 /// parser!{
 ///     // Give the created type a unique name
 ///     #[derive(Clone)]
 ///     pub struct Twice;
 ///     pub fn twice[Input, F, P](f: F)(Input) -&gt; (P::Output, P::Output)
 ///         where [P: Parser&lt;Input&gt;,
 ///                F: FnMut() -&gt; P]
 ///     {
 ///         (f(), f())
 ///     }
 /// }
 ///
 /// fn main() {
 ///     assert_eq!(integer().easy_parse(&quot;123&quot;), Ok((123, &quot;&quot;)));
 ///     assert!(integer().easy_parse(&quot;!&quot;).is_err());
 ///
 ///     assert_eq!(
 ///         integer_or_string().easy_parse(&quot;123&quot;),
 ///         Ok((IntOrString::Int(123), &quot;&quot;))
 ///     );
 ///     assert_eq!(
 ///         integer_or_string().easy_parse(&quot;abc&quot;),
 ///         Ok((IntOrString::String(&quot;abc&quot;.to_string()), &quot;&quot;))
 ///     );
 ///     assert_eq!(twice(|| digit()).parse(&quot;123&quot;), Ok(((&#39;1&#39;, &#39;2&#39;), &quot;3&quot;)));
 /// }
 /// ```
 </span><span class="attribute">#[macro_export]
 </span><span class="macro">macro_rules! </span>parser {
     (
         <span class="kw">type </span>PartialState = <span class="macro-nonterminal">$partial_state</span>: ty;
         $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta]</span>)*
         <span class="macro-nonterminal">$fn_vis</span>: vis <span class="kw">fn </span><span class="macro-nonterminal">$name</span>: ident [$(<span class="macro-nonterminal">$type_params</span>: tt)<span class="kw-2">*</span>]( $(<span class="macro-nonterminal">$arg</span>: ident :  <span class="macro-nonterminal">$arg_type</span>: ty),<span class="kw-2">*</span>)
             (<span class="macro-nonterminal">$input_type</span>: ty) -&gt; <span class="macro-nonterminal">$output_type</span>: ty
             <span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>: tt)<span class="kw-2">*</span>]
         <span class="macro-nonterminal">$parser</span>: block
     ) =&gt; {
         <span class="macro-nonterminal">$</span><span class="macro">crate::combine_parser_impl!</span>{
             <span class="attribute">#[<span class="macro-nonterminal">allow</span>(non_camel_case_types)]
             #[doc(hidden)]
             </span><span class="macro-nonterminal">$fn_vis </span><span class="kw">struct </span><span class="macro-nonterminal">$name</span>;
             (<span class="kw">type </span>PartialState = (<span class="macro-nonterminal">$partial_state</span>);)
             $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)*
             <span class="macro-nonterminal">$fn_vis </span><span class="kw">fn </span><span class="macro-nonterminal">$name </span>[$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>]($(<span class="macro-nonterminal">$arg </span>: <span class="macro-nonterminal">$arg_type</span>),<span class="kw-2">*</span>)(<span class="macro-nonterminal">$input_type</span>) -&gt; <span class="macro-nonterminal">$output_type
                 </span><span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>)<span class="kw-2">*</span>]
             <span class="macro-nonterminal">$parser
         </span>}
     };
     (
         $(<span class="attribute">#[<span class="macro-nonterminal">$derive</span>:meta]</span>)*
         <span class="macro-nonterminal">$struct_vis</span>: vis <span class="kw">struct </span><span class="macro-nonterminal">$type_name</span>: ident;
         <span class="kw">type </span>PartialState = <span class="macro-nonterminal">$partial_state</span>: ty;
         $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta]</span>)*
         <span class="macro-nonterminal">$fn_vis</span>: vis <span class="kw">fn </span><span class="macro-nonterminal">$name</span>: ident [$(<span class="macro-nonterminal">$type_params</span>: tt)<span class="kw-2">*</span>]( $(<span class="macro-nonterminal">$arg</span>: ident :  <span class="macro-nonterminal">$arg_type</span>: ty),* )
             (<span class="macro-nonterminal">$input_type</span>: ty) -&gt; <span class="macro-nonterminal">$output_type</span>: ty
             <span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>: tt)<span class="kw-2">*</span>]
         <span class="macro-nonterminal">$parser</span>: block
     ) =&gt; {
         <span class="macro-nonterminal">$</span><span class="macro">crate::combine_parser_impl!</span>{
             $(<span class="attribute">#[<span class="macro-nonterminal">$derive</span>]</span>)*
             <span class="macro-nonterminal">$struct_vis </span><span class="kw">struct </span><span class="macro-nonterminal">$type_name</span>;
             (<span class="kw">type </span>PartialState = (<span class="macro-nonterminal">$partial_state</span>);)
             $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)*
             <span class="macro-nonterminal">$fn_vis </span><span class="kw">fn </span><span class="macro-nonterminal">$name </span>[$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>]($(<span class="macro-nonterminal">$arg </span>: <span class="macro-nonterminal">$arg_type</span>),<span class="kw-2">*</span>)(<span class="macro-nonterminal">$input_type</span>) -&gt; <span class="macro-nonterminal">$output_type
                 </span><span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>)<span class="kw-2">*</span>]
             <span class="macro-nonterminal">$parser
         </span>}
     };
     (
         $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta]</span>)*
         <span class="macro-nonterminal">$fn_vis</span>: vis <span class="kw">fn </span><span class="macro-nonterminal">$name</span>: ident [$(<span class="macro-nonterminal">$type_params</span>: tt)<span class="kw-2">*</span>]( $(<span class="macro-nonterminal">$arg</span>: ident :  <span class="macro-nonterminal">$arg_type</span>: ty),<span class="kw-2">*</span>)
             (<span class="macro-nonterminal">$input_type</span>: ty) -&gt; <span class="macro-nonterminal">$output_type</span>: ty
             <span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>: tt)<span class="kw-2">*</span>]
         <span class="macro-nonterminal">$parser</span>: block
     ) =&gt; {
         <span class="macro-nonterminal">$</span><span class="macro">crate::combine_parser_impl!</span>{
             <span class="attribute">#[<span class="macro-nonterminal">allow</span>(non_camel_case_types)]
             #[doc(hidden)]
             </span><span class="macro-nonterminal">$fn_vis </span><span class="kw">struct </span><span class="macro-nonterminal">$name</span>;
             (<span class="kw">type </span>PartialState = (());)
             $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)*
             <span class="macro-nonterminal">$fn_vis </span><span class="kw">fn </span><span class="macro-nonterminal">$name </span>[$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>]($(<span class="macro-nonterminal">$arg </span>: <span class="macro-nonterminal">$arg_type</span>),<span class="kw-2">*</span>)(<span class="macro-nonterminal">$input_type</span>) -&gt; <span class="macro-nonterminal">$output_type
                 </span><span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>)<span class="kw-2">*</span>]
             <span class="macro-nonterminal">$parser
         </span>}
     };
     (
         $(<span class="attribute">#[<span class="macro-nonterminal">$derive</span>:meta]</span>)*
         <span class="macro-nonterminal">$struct_vis</span>: vis <span class="kw">struct </span><span class="macro-nonterminal">$type_name</span>: ident;
         $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta]</span>)*
         <span class="macro-nonterminal">$fn_vis</span>: vis <span class="kw">fn </span><span class="macro-nonterminal">$name</span>: ident [$(<span class="macro-nonterminal">$type_params</span>: tt)<span class="kw-2">*</span>]( $(<span class="macro-nonterminal">$arg</span>: ident :  <span class="macro-nonterminal">$arg_type</span>: ty),* )
             (<span class="macro-nonterminal">$input_type</span>: ty) -&gt; <span class="macro-nonterminal">$output_type</span>: ty
             <span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>: tt)<span class="kw-2">*</span>]
         <span class="macro-nonterminal">$parser</span>: block
     ) =&gt; {
         <span class="macro-nonterminal">$</span><span class="macro">crate::combine_parser_impl!</span>{
             $(<span class="attribute">#[<span class="macro-nonterminal">$derive</span>]</span>)*
             <span class="macro-nonterminal">$struct_vis </span><span class="kw">struct </span><span class="macro-nonterminal">$type_name</span>;
             (<span class="kw">type </span>PartialState = (());)
             $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)*
             <span class="macro-nonterminal">$fn_vis </span><span class="kw">fn </span><span class="macro-nonterminal">$name </span>[$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>]($(<span class="macro-nonterminal">$arg </span>: <span class="macro-nonterminal">$arg_type</span>),<span class="kw-2">*</span>)(<span class="macro-nonterminal">$input_type</span>) -&gt; <span class="macro-nonterminal">$output_type
                 </span><span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>)<span class="kw-2">*</span>]
             <span class="macro-nonterminal">$parser
         </span>}
     };
 }

 <span class="attribute">#[doc(hidden)]
 #[macro_export]
 </span><span class="macro">macro_rules! </span>combine_parse_partial {
     ((()) <span class="macro-nonterminal">$mode</span>:ident <span class="macro-nonterminal">$input</span>:ident <span class="macro-nonterminal">$state</span>:ident <span class="macro-nonterminal">$parser</span>:block) =&gt; {{
         <span class="kw">let _ </span>= <span class="macro-nonterminal">$state</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>state = Default::default();
         <span class="kw">let </span>state = <span class="kw-2">&amp;mut </span>state;
         <span class="macro-nonterminal">$parser</span>.parse_mode(<span class="macro-nonterminal">$mode</span>, <span class="macro-nonterminal">$input</span>, state)
     }};
     ((<span class="macro-nonterminal">$ignored</span>:ty) <span class="macro-nonterminal">$mode</span>:ident <span class="macro-nonterminal">$input</span>:ident <span class="macro-nonterminal">$state</span>:ident <span class="macro-nonterminal">$parser</span>:block) =&gt; {
         <span class="macro-nonterminal">$parser</span>.parse_mode(<span class="macro-nonterminal">$mode</span>, <span class="macro-nonterminal">$input</span>, <span class="macro-nonterminal">$state</span>)
     };
 }

 <span class="attribute">#[doc(hidden)]
 #[macro_export]
 </span><span class="macro">macro_rules! </span>combine_parser_impl {
     (
         $(<span class="attribute">#[<span class="macro-nonterminal">$derive</span>:meta]</span>)*
         <span class="macro-nonterminal">$struct_vis</span>: vis <span class="kw">struct </span><span class="macro-nonterminal">$type_name</span>: ident;
         (<span class="kw">type </span>PartialState = ($(<span class="macro-nonterminal">$partial_state</span>: tt)<span class="kw-2">*</span>);)
         $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>:meta]</span>)*
         <span class="macro-nonterminal">$fn_vis</span>: vis <span class="kw">fn </span><span class="macro-nonterminal">$name</span>: ident [$(<span class="macro-nonterminal">$type_params</span>: tt)<span class="kw-2">*</span>]( $(<span class="macro-nonterminal">$arg</span>: ident :  <span class="macro-nonterminal">$arg_type</span>: ty),<span class="kw-2">*</span>)
             (<span class="macro-nonterminal">$input_type</span>: ty) -&gt; <span class="macro-nonterminal">$output_type</span>: ty
             <span class="kw">where </span>[$(<span class="macro-nonterminal">$where_clause</span>: tt)<span class="kw-2">*</span>]
         <span class="macro-nonterminal">$parser</span>: block
     ) =&gt; {

         $(<span class="attribute">#[<span class="macro-nonterminal">$derive</span>]</span>)*
         <span class="macro-nonterminal">$struct_vis </span><span class="kw">struct </span><span class="macro-nonterminal">$type_name</span>&lt;$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>&gt;
             <span class="kw">where </span>&lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Error:
                 <span class="macro-nonterminal">$crate::error::ParseError</span>&lt;
                     &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Token,
                     &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Range,
                     &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Position
                     &gt;,
                 <span class="macro-nonterminal">$input_type</span>: <span class="macro-nonterminal">$crate::stream::Stream</span>,
                 $(<span class="macro-nonterminal">$where_clause</span>)*
         {
             $(<span class="kw">pub </span><span class="macro-nonterminal">$arg </span>: <span class="macro-nonterminal">$arg_type</span>,)*
             __marker: <span class="macro-nonterminal">$crate::lib::marker::PhantomData</span>&lt;<span class="kw">fn </span>(<span class="macro-nonterminal">$input_type</span>) -&gt; <span class="macro-nonterminal">$output_type</span>&gt;
         }

         <span class="comment">// We want this to work on older compilers, at least for a while
         </span><span class="attribute">#[allow(non_shorthand_field_patterns)]
         </span><span class="kw">impl</span>&lt;$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>&gt; <span class="macro-nonterminal">$crate::Parser</span>&lt;<span class="macro-nonterminal">$input_type</span>&gt; <span class="kw">for </span><span class="macro-nonterminal">$type_name</span>&lt;$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>&gt;
             <span class="kw">where </span>&lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Error:
                     <span class="macro-nonterminal">$crate::error::ParseError</span>&lt;
                         &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Token,
                         &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Range,
                         &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Position
                         &gt;,
                 <span class="macro-nonterminal">$input_type</span>: <span class="macro-nonterminal">$crate::stream::Stream</span>,
                 $(<span class="macro-nonterminal">$where_clause</span>)*
         {

             <span class="kw">type </span>Output = <span class="macro-nonterminal">$output_type</span>;
             <span class="kw">type </span>PartialState = $(<span class="macro-nonterminal">$partial_state</span>)<span class="kw-2">*</span>;

             <span class="macro-nonterminal">$</span><span class="macro">crate::parse_mode!</span>(<span class="macro-nonterminal">$input_type</span>);
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>parse_mode_impl&lt;M&gt;(
                 <span class="kw-2">&amp;mut </span><span class="self">self</span>,
                 mode: M,
                 input: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$input_type</span>,
                 state: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
                 ) -&gt; <span class="macro-nonterminal">$crate::error::ParseResult</span>&lt;<span class="macro-nonterminal">$output_type</span>, &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Error&gt;
             <span class="kw">where </span>M: <span class="macro-nonterminal">$crate::parser::ParseMode
             </span>{
                 <span class="kw">let </span><span class="macro-nonterminal">$type_name </span>{ $( <span class="macro-nonterminal">$arg</span>: <span class="kw-2">ref mut </span><span class="macro-nonterminal">$arg</span>,)* .. } = <span class="kw-2">*</span><span class="self">self</span>;
                 <span class="macro-nonterminal">$</span><span class="macro">crate::combine_parse_partial!</span>(($(<span class="macro-nonterminal">$partial_state</span>)<span class="kw-2">*</span>) mode input state <span class="macro-nonterminal">$parser</span>)
             }

             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>add_error(
                 <span class="kw-2">&amp;mut </span><span class="self">self</span>,
                 errors: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$crate::error::Tracked</span>&lt;
                     &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Error
                     &gt;)
             {
                 <span class="kw">let </span><span class="macro-nonterminal">$type_name </span>{ $( <span class="macro-nonterminal">$arg </span>: <span class="kw-2">ref mut </span><span class="macro-nonterminal">$arg</span>,)*  .. } = <span class="kw-2">*</span><span class="self">self</span>;
                 <span class="kw">let </span><span class="kw-2">mut </span>parser = <span class="macro-nonterminal">$parser</span>;
                 {
                     <span class="kw">let _</span>: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span><span class="macro-nonterminal">$crate::Parser</span>&lt; <span class="macro-nonterminal">$input_type</span>, Output = <span class="macro-nonterminal">$output_type</span>, PartialState = <span class="kw">_</span>&gt; = <span class="kw-2">&amp;mut </span>parser;
                 }
                 parser.add_error(errors)
             }

             <span class="kw">fn </span>add_committed_expected_error(
                 <span class="kw-2">&amp;mut </span><span class="self">self</span>,
                 errors: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$crate::error::Tracked</span>&lt;
                     &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Error
                     &gt;)
             {
                 <span class="kw">let </span><span class="macro-nonterminal">$type_name </span>{ $( <span class="macro-nonterminal">$arg </span>: <span class="kw-2">ref mut </span><span class="macro-nonterminal">$arg</span>,)*  .. } = <span class="kw-2">*</span><span class="self">self</span>;
                 <span class="kw">let </span><span class="kw-2">mut </span>parser = <span class="macro-nonterminal">$parser</span>;
                 {
                     <span class="kw">let _</span>: <span class="kw-2">&amp;mut </span><span class="kw">dyn </span><span class="macro-nonterminal">$crate::Parser</span>&lt; <span class="macro-nonterminal">$input_type</span>, Output = <span class="macro-nonterminal">$output_type</span>, PartialState = <span class="kw">_</span>&gt; = <span class="kw-2">&amp;mut </span>parser;
                 }
                 parser.add_committed_expected_error(errors)
             }
         }

         $(<span class="attribute">#[<span class="macro-nonterminal">$attr</span>]</span>)*
         <span class="attribute">#[inline]
         </span><span class="macro-nonterminal">$fn_vis </span><span class="kw">fn </span><span class="macro-nonterminal">$name</span>&lt; $(<span class="macro-nonterminal">$type_params</span>)* &gt;(
                 $(<span class="macro-nonterminal">$arg </span>: <span class="macro-nonterminal">$arg_type</span>),*
             ) -&gt; <span class="macro-nonterminal">$type_name</span>&lt;$(<span class="macro-nonterminal">$type_params</span>)<span class="kw-2">*</span>&gt;
             <span class="kw">where </span>&lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Error:
                     <span class="macro-nonterminal">$crate::error::ParseError</span>&lt;
                         &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Token,
                         &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Range,
                         &lt;<span class="macro-nonterminal">$input_type </span><span class="kw">as </span><span class="macro-nonterminal">$crate::stream::StreamOnce</span>&gt;::Position
                         &gt;,
                 <span class="macro-nonterminal">$input_type</span>: <span class="macro-nonterminal">$crate::stream::Stream</span>,
                 $(<span class="macro-nonterminal">$where_clause</span>)*
         {
             <span class="macro-nonterminal">$type_name </span>{
                 $(<span class="macro-nonterminal">$arg</span>,)*
                 __marker: <span class="macro-nonterminal">$crate::lib::marker::PhantomData
             </span>}
         }
     };
 }

 <span class="doccomment">/// Internal API. May break without a semver bump
 </span><span class="macro">macro_rules! </span>forward_parser {
     (<span class="macro-nonterminal">$input</span>: ty, <span class="macro-nonterminal">$method</span>: ident $( <span class="macro-nonterminal">$methods</span>: ident)<span class="kw-2">*</span>, $(<span class="macro-nonterminal">$field</span>: tt)<span class="kw-2">*</span>) =&gt; {
         <span class="macro">forward_parser!</span>(<span class="macro-nonterminal">$input</span>, <span class="macro-nonterminal">$method </span>$(<span class="macro-nonterminal">$field</span>)+);
         <span class="macro">forward_parser!</span>(<span class="macro-nonterminal">$input</span>, $(<span class="macro-nonterminal">$methods</span>)<span class="kw-2">*</span>, $(<span class="macro-nonterminal">$field</span>)+);
     };
     (<span class="macro-nonterminal">$input</span>: ty, parse_mode $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {
         <span class="attribute">#[inline]
         </span><span class="kw">fn </span>parse_mode_impl&lt;M&gt;(
             <span class="kw-2">&amp;mut </span><span class="self">self</span>,
             mode: M,
             input: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$input</span>,
             state: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
         ) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;<span class="macro-nonterminal">$input </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>&gt;::Error&gt;
         <span class="kw">where
             </span>M: ParseMode,
         {
             <span class="self">self</span>.$(<span class="macro-nonterminal">$field</span>)+.parse_mode(mode, input, state).map(|(a, <span class="kw">_</span>)| a)
         }
     };
     (<span class="macro-nonterminal">$input</span>: ty, parse_lazy $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {
         <span class="kw">fn </span>parse_lazy(
             <span class="kw-2">&amp;mut </span><span class="self">self</span>,
             input: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$input</span>,
         ) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;<span class="macro-nonterminal">$input </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>&gt;::Error&gt; {
             <span class="self">self</span>.$(<span class="macro-nonterminal">$field</span>)+.parse_lazy(input)
         }
     };
     (<span class="macro-nonterminal">$input</span>: ty, parse_first $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {
         <span class="kw">fn </span>parse_first(
             <span class="kw-2">&amp;mut </span><span class="self">self</span>,
             input: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$input</span>,
             state: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
         ) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;<span class="macro-nonterminal">$input </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>&gt;::Error&gt; {
             <span class="self">self</span>.$(<span class="macro-nonterminal">$field</span>)+.parse_first(input, state)
         }
     };
     (<span class="macro-nonterminal">$input</span>: ty, parse_partial $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {
         <span class="kw">fn </span>parse_partial(
             <span class="kw-2">&amp;mut </span><span class="self">self</span>,
             input: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$input</span>,
             state: <span class="kw-2">&amp;mut </span><span class="self">Self</span>::PartialState,
         ) -&gt; ParseResult&lt;<span class="self">Self</span>::Output, &lt;<span class="macro-nonterminal">$input </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>&gt;::Error&gt; {
             <span class="self">self</span>.$(<span class="macro-nonterminal">$field</span>)+.parse_partial(input, state)
         }
     };
     (<span class="macro-nonterminal">$input</span>: ty, add_error $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {

         <span class="kw">fn </span>add_error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, error: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$crate::error::Tracked</span>&lt;&lt;<span class="macro-nonterminal">$input </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>&gt;::Error&gt;) {
             <span class="self">self</span>.$(<span class="macro-nonterminal">$field</span>)+.add_error(error)
         }
     };
     (<span class="macro-nonterminal">$input</span>: ty, add_committed_expected_error $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {
         <span class="kw">fn </span>add_committed_expected_error(<span class="kw-2">&amp;mut </span><span class="self">self</span>, error: <span class="kw-2">&amp;mut </span><span class="macro-nonterminal">$crate::error::Tracked</span>&lt;&lt;<span class="macro-nonterminal">$input </span><span class="kw">as </span><span class="macro-nonterminal">$crate::StreamOnce</span>&gt;::Error&gt;) {
             <span class="self">self</span>.$(<span class="macro-nonterminal">$field</span>)+.add_committed_expected_error(error)
         }
     };
     (<span class="macro-nonterminal">$input</span>: ty, parser_count $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {
         <span class="kw">fn </span>parser_count(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="macro-nonterminal">$crate::ErrorOffset </span>{
             <span class="self">self</span>.$(<span class="macro-nonterminal">$field</span>)+.parser_count()
         }
     };
     (<span class="macro-nonterminal">$input</span>: ty, <span class="macro-nonterminal">$field</span>: tt) =&gt; {
         <span class="macro">forward_parser!</span>(<span class="macro-nonterminal">$input</span>, parse_lazy parse_first parse_partial add_error add_committed_expected_error parser_count, <span class="macro-nonterminal">$field</span>);
     };
     (<span class="macro-nonterminal">$input</span>: ty, $(<span class="macro-nonterminal">$field</span>: tt)+) =&gt; {
     };
 }

 <span class="comment">// Facade over the core types we need
 // Public but hidden to be accessible in macros
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub mod </span>lib {
     <span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
     </span><span class="kw">pub use </span>core::<span class="kw-2">*</span>;

     <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
     </span><span class="kw">pub use </span>std::<span class="kw-2">*</span>;
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 #[doc(inline)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::stream::easy;

 <span class="doccomment">/// Error types and traits which define what kind of errors combine parsers may emit
 </span><span class="attribute">#[macro_use]
 </span><span class="kw">pub mod </span>error;
 <span class="attribute">#[macro_use]
 </span><span class="kw">pub mod </span>stream;
 <span class="attribute">#[macro_use]
 </span><span class="kw">pub mod </span>parser;

 <span class="attribute">#[cfg(feature = <span class="string">&quot;futures-core-03&quot;</span>)]
 </span><span class="kw">pub mod </span>future_ext;

 <span class="attribute">#[doc(hidden)]
 #[derive(Clone, PartialOrd, PartialEq, Debug, Copy)]
 </span><span class="kw">pub struct </span>ErrorOffset(u8);

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {

     <span class="kw">use </span><span class="kw">crate</span>::parser::char::{char, string};

     <span class="kw">use super</span>::<span class="kw-2">*</span>;

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>chainl1_error_consume() {
         <span class="kw">fn </span>first&lt;T, U&gt;(t: T, <span class="kw">_</span>: U) -&gt; T {
             t
         }
         <span class="kw">let </span><span class="kw-2">mut </span>p = chainl1(string(<span class="string">&quot;abc&quot;</span>), char(<span class="string">&#39;,&#39;</span>).map(|<span class="kw">_</span>| first));
         <span class="macro">assert!</span>(p.parse(<span class="string">&quot;abc,ab&quot;</span>).is_err());
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>choice_strings() {
         <span class="kw">let </span><span class="kw-2">mut </span>fruits = [
             attempt(string(<span class="string">&quot;Apple&quot;</span>)),
             attempt(string(<span class="string">&quot;Banana&quot;</span>)),
             attempt(string(<span class="string">&quot;Cherry&quot;</span>)),
             attempt(string(<span class="string">&quot;Date&quot;</span>)),
             attempt(string(<span class="string">&quot;Fig&quot;</span>)),
             attempt(string(<span class="string">&quot;Grape&quot;</span>)),
         ];
         <span class="kw">let </span><span class="kw-2">mut </span>parser = choice(<span class="kw-2">&amp;mut </span>fruits);
         <span class="macro">assert_eq!</span>(parser.parse(<span class="string">&quot;Apple&quot;</span>), <span class="prelude-val">Ok</span>((<span class="string">&quot;Apple&quot;</span>, <span class="string">&quot;&quot;</span>)));
         <span class="macro">assert_eq!</span>(parser.parse(<span class="string">&quot;Banana&quot;</span>), <span class="prelude-val">Ok</span>((<span class="string">&quot;Banana&quot;</span>, <span class="string">&quot;&quot;</span>)));
         <span class="macro">assert_eq!</span>(parser.parse(<span class="string">&quot;Cherry&quot;</span>), <span class="prelude-val">Ok</span>((<span class="string">&quot;Cherry&quot;</span>, <span class="string">&quot;&quot;</span>)));
         <span class="macro">assert_eq!</span>(parser.parse(<span class="string">&quot;DateABC&quot;</span>), <span class="prelude-val">Ok</span>((<span class="string">&quot;Date&quot;</span>, <span class="string">&quot;ABC&quot;</span>)));
         <span class="macro">assert_eq!</span>(parser.parse(<span class="string">&quot;Fig123&quot;</span>), <span class="prelude-val">Ok</span>((<span class="string">&quot;Fig&quot;</span>, <span class="string">&quot;123&quot;</span>)));
         <span class="macro">assert_eq!</span>(parser.parse(<span class="string">&quot;GrapeApple&quot;</span>), <span class="prelude-val">Ok</span>((<span class="string">&quot;Grape&quot;</span>, <span class="string">&quot;Apple&quot;</span>)));
     }
 }

 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;std&quot;</span>, test))]
 </span><span class="kw">mod </span>std_tests {

     <span class="kw">use crate</span>::{
         error::StdParseResult,
         parser::char::{alpha_num, char, digit, letter, spaces, string},
         stream::{
             easy,
             position::{<span class="self">self</span>, SourcePosition},
         },
     };

     <span class="kw">use super</span>::{easy::Error, error::Commit, stream::IteratorStream, <span class="kw-2">*</span>};

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>optional_error_consume() {
         <span class="kw">let </span><span class="kw-2">mut </span>p = optional(string(<span class="string">&quot;abc&quot;</span>));
         <span class="kw">let </span>err = p.easy_parse(position::Stream::new(<span class="string">&quot;ab&quot;</span>)).unwrap_err();
         <span class="macro">assert_eq!</span>(err.position, SourcePosition { line: <span class="number">1</span>, column: <span class="number">1 </span>});
     }

     <span class="kw">fn </span>follow&lt;Input&gt;(input: <span class="kw-2">&amp;mut </span>Input) -&gt; StdParseResult&lt;(), Input&gt;
     <span class="kw">where
         </span>Input: Stream&lt;Token = char, Error = easy::ParseError&lt;Input&gt;&gt;,
         Input::Position: Default,
         Input::Error: std::fmt::Debug,
         Input::Token: PartialEq,
         Input::Range: PartialEq,
     {
         <span class="kw">let </span>before = input.checkpoint();
         <span class="kw">match </span>input.uncons() {
             <span class="prelude-val">Ok</span>(c) =&gt; {
                 <span class="kw">if </span>c.is_alphanumeric() {
                     input.reset(before).unwrap();
                     <span class="kw">let </span>e = Error::Unexpected(c.into());
                     <span class="prelude-val">Err</span>(Commit::Peek(easy::Errors::new(input.position(), e).into()))
                 } <span class="kw">else </span>{
                     <span class="prelude-val">Ok</span>(((), Commit::Peek(())))
                 }
             }
             <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Ok</span>(((), Commit::Peek(()))),
         }
     }

     <span class="kw">fn </span>integer&lt;Input&gt;(input: <span class="kw-2">&amp;mut </span>Input) -&gt; StdParseResult&lt;i64, Input&gt;
     <span class="kw">where
         </span>Input: Stream&lt;Token = char&gt;,
         Input::Error: ParseError&lt;Input::Token, Input::Range, Input::Position&gt;,
     {
         <span class="kw">let </span>(s, input) = many1::&lt;String, <span class="kw">_</span>, <span class="kw">_</span>&gt;(digit())
             .expected(<span class="string">&quot;integer&quot;</span>)
             .parse_stream(input)
             .into_result()<span class="question-mark">?</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>n = <span class="number">0</span>;
         <span class="kw">for </span>c <span class="kw">in </span>s.chars() {
             n = n * <span class="number">10 </span>+ (c <span class="kw">as </span>i64 - <span class="string">&#39;0&#39; </span><span class="kw">as </span>i64);
         }
         <span class="prelude-val">Ok</span>((n, input))
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_integer() {
         <span class="kw">let </span>result = parser(integer).parse(<span class="string">&quot;123&quot;</span>);
         <span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="number">123i64</span>, <span class="string">&quot;&quot;</span>)));
     }
     <span class="attribute">#[test]
     </span><span class="kw">fn </span>list() {
         <span class="kw">let </span><span class="kw-2">mut </span>p = sep_by(parser(integer), char(<span class="string">&#39;,&#39;</span>));
         <span class="kw">let </span>result = p.parse(<span class="string">&quot;123,4,56&quot;</span>);
         <span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="macro">vec!</span>[<span class="number">123i64</span>, <span class="number">4</span>, <span class="number">56</span>], <span class="string">&quot;&quot;</span>)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>iterator() {
         <span class="kw">let </span>result = parser(integer)
             .parse(position::Stream::new(IteratorStream::new(<span class="string">&quot;123&quot;</span>.chars())))
             .map(|(i, <span class="kw-2">mut </span>input)| (i, input.uncons().is_err()));
         <span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="number">123i64</span>, <span class="bool-val">true</span>)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>field() {
         <span class="kw">let </span>word = || many(alpha_num());
         <span class="kw">let </span>c_decl = (word(), spaces(), char(<span class="string">&#39;:&#39;</span>), spaces(), word())
             .map(|t| (t.<span class="number">0</span>, t.<span class="number">4</span>))
             .parse(<span class="string">&quot;x: int&quot;</span>);
         <span class="macro">assert_eq!</span>(c_decl, <span class="prelude-val">Ok</span>(((<span class="string">&quot;x&quot;</span>.to_string(), <span class="string">&quot;int&quot;</span>.to_string()), <span class="string">&quot;&quot;</span>)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>source_position() {
         <span class="kw">let </span>source = <span class="string">r&quot;
 123
 &quot;</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>parsed_state = position::Stream::with_positioner(source, SourcePosition::new());
         <span class="kw">let </span>result = (spaces(), parser(integer), spaces())
             .map(|t| t.<span class="number">1</span>)
             .parse_stream(<span class="kw-2">&amp;mut </span>parsed_state)
             .into_result();
         <span class="kw">let </span>state = Commit::Commit(position::Stream {
             positioner: SourcePosition { line: <span class="number">3</span>, column: <span class="number">1 </span>},
             input: <span class="string">&quot;&quot;</span>,
         });
         <span class="macro">assert_eq!</span>(
             result.map(|(x, c)| (x, c.map(|<span class="kw">_</span>| parsed_state))),
             <span class="prelude-val">Ok</span>((<span class="number">123i64</span>, state))
         );
     }

     <span class="attribute">#[derive(Debug, PartialEq)]
     </span><span class="kw">pub enum </span>Expr {
         Id(String),
         Int(i64),
         Array(Vec&lt;Expr&gt;),
         Plus(Box&lt;Expr&gt;, Box&lt;Expr&gt;),
         Times(Box&lt;Expr&gt;, Box&lt;Expr&gt;),
     }

     <span class="macro">parser! </span>{
         <span class="kw">fn </span>expr[Input]()(Input) -&gt; Expr
         <span class="kw">where
             </span>[Input: Stream&lt;Token = char&gt;,]
         {
             <span class="kw">let </span>word = many1(letter()).expected(<span class="string">&quot;identifier&quot;</span>);
             <span class="kw">let </span>integer = parser(integer);
             <span class="kw">let </span>array = between(char(<span class="string">&#39;[&#39;</span>), char(<span class="string">&#39;]&#39;</span>), sep_by(expr(), char(<span class="string">&#39;,&#39;</span>))).expected(<span class="string">&quot;[&quot;</span>);
             <span class="kw">let </span>paren_expr = between(char(<span class="string">&#39;(&#39;</span>), char(<span class="string">&#39;)&#39;</span>), parser(term)).expected(<span class="string">&quot;(&quot;</span>);
             spaces()
                 .silent()
                 .with(
                     word.map(Expr::Id)
                         .or(integer.map(Expr::Int))
                         .or(array.map(Expr::Array))
                         .or(paren_expr),
                 )
                 .skip(spaces().silent())
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>expression_basic() {
         <span class="kw">let </span>result = sep_by(expr(), char(<span class="string">&#39;,&#39;</span>)).parse(<span class="string">&quot;int, 100, [[], 123]&quot;</span>);
         <span class="kw">let </span>exprs = <span class="macro">vec!</span>[
             Expr::Id(<span class="string">&quot;int&quot;</span>.to_string()),
             Expr::Int(<span class="number">100</span>),
             Expr::Array(<span class="macro">vec!</span>[Expr::Array(<span class="macro">vec!</span>[]), Expr::Int(<span class="number">123</span>)]),
         ];
         <span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((exprs, <span class="string">&quot;&quot;</span>)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>expression_error() {
         <span class="kw">let </span>input = <span class="string">r&quot;
 ,123
 &quot;</span>;
         <span class="kw">let </span>result = expr().easy_parse(position::Stream::new(input));
         <span class="kw">let </span>err = easy::Errors {
             position: SourcePosition { line: <span class="number">2</span>, column: <span class="number">1 </span>},
             errors: <span class="macro">vec!</span>[
                 Error::Unexpected(<span class="string">&#39;,&#39;</span>.into()),
                 Error::Expected(<span class="string">&quot;integer&quot;</span>.into()),
                 Error::Expected(<span class="string">&quot;identifier&quot;</span>.into()),
                 Error::Expected(<span class="string">&quot;[&quot;</span>.into()),
                 Error::Expected(<span class="string">&quot;(&quot;</span>.into()),
             ],
         };
         <span class="macro">assert_eq!</span>(result, <span class="prelude-val">Err</span>(err));
     }

     <span class="kw">fn </span>term&lt;Input&gt;(input: <span class="kw-2">&amp;mut </span>Input) -&gt; StdParseResult&lt;Expr, Input&gt;
     <span class="kw">where
         </span>Input: Stream&lt;Token = char&gt;,
         Input::Error: ParseError&lt;Input::Token, Input::Range, Input::Position&gt;,
     {
         <span class="kw">fn </span>times(l: Expr, r: Expr) -&gt; Expr {
             Expr::Times(Box::new(l), Box::new(r))
         }
         <span class="kw">fn </span>plus(l: Expr, r: Expr) -&gt; Expr {
             Expr::Plus(Box::new(l), Box::new(r))
         }
         <span class="kw">let </span>mul = char(<span class="string">&#39;*&#39;</span>).map(|<span class="kw">_</span>| times);
         <span class="kw">let </span>add = char(<span class="string">&#39;+&#39;</span>).map(|<span class="kw">_</span>| plus);
         <span class="kw">let </span>factor = chainl1(expr(), mul);
         chainl1(factor, add).parse_stream(input).into()
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>operators() {
         <span class="kw">let </span>input = <span class="string">r&quot;
 1 * 2 + 3 * test
 &quot;</span>;
         <span class="kw">let </span>(result, <span class="kw">_</span>) = parser(term).parse(position::Stream::new(input)).unwrap();

         <span class="kw">let </span>e1 = Expr::Times(Box::new(Expr::Int(<span class="number">1</span>)), Box::new(Expr::Int(<span class="number">2</span>)));
         <span class="kw">let </span>e2 = Expr::Times(
             Box::new(Expr::Int(<span class="number">3</span>)),
             Box::new(Expr::Id(<span class="string">&quot;test&quot;</span>.to_string())),
         );
         <span class="macro">assert_eq!</span>(result, Expr::Plus(Box::new(e1), Box::new(e2)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>error_position() {
         <span class="kw">let </span><span class="kw-2">mut </span>p = string(<span class="string">&quot;let&quot;</span>)
             .skip(parser(follow))
             .map(|x| x.to_string())
             .or(many1(digit()));
         <span class="kw">match </span>p.easy_parse(position::Stream::new(<span class="string">&quot;le123&quot;</span>)) {
             <span class="prelude-val">Ok</span>(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(),
             <span class="prelude-val">Err</span>(err) =&gt; <span class="macro">assert_eq!</span>(err.position, SourcePosition { line: <span class="number">1</span>, column: <span class="number">1 </span>}),
         }
         <span class="kw">match </span>p.easy_parse(position::Stream::new(<span class="string">&quot;let1&quot;</span>)) {
             <span class="prelude-val">Ok</span>(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(),
             <span class="prelude-val">Err</span>(err) =&gt; <span class="macro">assert_eq!</span>(err.position, SourcePosition { line: <span class="number">1</span>, column: <span class="number">4 </span>}),
         }
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>sep_by_error_consume() {
         <span class="kw">let </span><span class="kw-2">mut </span>p = sep_by::&lt;Vec&lt;<span class="kw">_</span>&gt;, <span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>&gt;(string(<span class="string">&quot;abc&quot;</span>), char(<span class="string">&#39;,&#39;</span>));
         <span class="kw">let </span>err = p.easy_parse(position::Stream::new(<span class="string">&quot;ab,abc&quot;</span>)).unwrap_err();
         <span class="macro">assert_eq!</span>(err.position, SourcePosition { line: <span class="number">1</span>, column: <span class="number">1 </span>});
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>inner_error_consume() {
         <span class="kw">let </span><span class="kw-2">mut </span>p = many::&lt;Vec&lt;<span class="kw">_</span>&gt;, <span class="kw">_</span>, <span class="kw">_</span>&gt;(between(char(<span class="string">&#39;[&#39;</span>), char(<span class="string">&#39;]&#39;</span>), digit()));
         <span class="kw">let </span>result = p.easy_parse(position::Stream::new(<span class="string">&quot;[1][2][]&quot;</span>));
         <span class="macro">assert!</span>(result.is_err(), <span class="string">&quot;{:?}&quot;</span>, result);
         <span class="kw">let </span>error = result.map(|x| <span class="macro">format!</span>(<span class="string">&quot;{:?}&quot;</span>, x)).unwrap_err();
         <span class="macro">assert_eq!</span>(error.position, SourcePosition { line: <span class="number">1</span>, column: <span class="number">8 </span>});
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>infinite_recursion_in_box_parser() {
         <span class="kw">let _</span>: <span class="prelude-ty">Result</span>&lt;(Vec&lt;<span class="kw">_</span>&gt;, <span class="kw">_</span>), <span class="kw">_</span>&gt; = (many(Box::new(digit()))).parse(<span class="string">&quot;1&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>unsized_parser() {
         <span class="kw">let </span><span class="kw-2">mut </span>parser: Box&lt;<span class="kw">dyn </span>Parser&lt;<span class="kw">_</span>, Output = char, PartialState = <span class="kw">_</span>&gt;&gt; = Box::new(digit());
         <span class="kw">let </span>borrow_parser = <span class="kw-2">&amp;mut *</span>parser;
         <span class="macro">assert_eq!</span>(borrow_parser.parse(<span class="string">&quot;1&quot;</span>), <span class="prelude-val">Ok</span>((<span class="string">&#39;1&#39;</span>, <span class="string">&quot;&quot;</span>)));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>std_error() {
         <span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError;

         <span class="kw">use </span>std::fmt;

         <span class="attribute">#[derive(Debug)]
         </span><span class="kw">struct </span>Error;
         <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Error {
             <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
                 <span class="macro">write!</span>(f, <span class="string">&quot;error&quot;</span>)
             }
         }
         <span class="kw">impl </span>StdError <span class="kw">for </span>Error {
             <span class="kw">fn </span>description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
                 <span class="string">&quot;error&quot;
             </span>}
         }
         <span class="kw">let </span>result: <span class="prelude-ty">Result</span>&lt;((), <span class="kw">_</span>), easy::Errors&lt;char, <span class="kw-2">&amp;</span>str, <span class="kw">_</span>&gt;&gt; =
             EasyParser::easy_parse(<span class="kw-2">&amp;mut </span>string(<span class="string">&quot;abc&quot;</span>).and_then(|<span class="kw">_</span>| <span class="prelude-val">Err</span>(Error)), <span class="string">&quot;abc&quot;</span>);
         <span class="macro">assert!</span>(result.is_err());
         <span class="comment">// Test that ParseError can be coerced to a StdError
         </span><span class="kw">let _ </span>= result.map_err(|err| {
             <span class="kw">let </span>err: Box&lt;<span class="kw">dyn </span>StdError&gt; = Box::new(err);
             err
         });
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>extract_std_error() {
         <span class="comment">// The previous test verified that we could map a ParseError to a StdError by dropping
         // the internal error details.
         // This test verifies that we can map a ParseError to a StdError
         // without dropping the internal error details.  Consumers using `error-chain` will
         // appreciate this.  For technical reasons this is pretty janky; see the discussion in
         // https://github.com/Marwes/combine/issues/86, and excuse the test with significant
         // boilerplate!
         </span><span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError;

         <span class="kw">use </span>std::fmt;

         <span class="attribute">#[derive(Clone, PartialEq, Debug)]
         </span><span class="kw">struct </span>CloneOnly(String);

         <span class="attribute">#[derive(Debug)]
         </span><span class="kw">struct </span>DisplayVec&lt;T&gt;(Vec&lt;T&gt;);

         <span class="attribute">#[derive(Debug)]
         </span><span class="kw">struct </span>ExtractedError(usize, DisplayVec&lt;Error&lt;CloneOnly, DisplayVec&lt;CloneOnly&gt;&gt;&gt;);

         <span class="kw">impl </span>StdError <span class="kw">for </span>ExtractedError {
             <span class="kw">fn </span>description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
                 <span class="string">&quot;extracted error&quot;
             </span>}
         }

         <span class="kw">impl </span>fmt::Display <span class="kw">for </span>CloneOnly {
             <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
                 <span class="macro">write!</span>(f, <span class="string">&quot;{}&quot;</span>, <span class="self">self</span>.<span class="number">0</span>)
             }
         }

         <span class="kw">impl</span>&lt;T: fmt::Debug&gt; fmt::Display <span class="kw">for </span>DisplayVec&lt;T&gt; {
             <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
                 <span class="macro">write!</span>(f, <span class="string">&quot;[{:?}]&quot;</span>, <span class="self">self</span>.<span class="number">0</span>)
             }
         }

         <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ExtractedError {
             <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
                 <span class="macro">writeln!</span>(f, <span class="string">&quot;Parse error at {}&quot;</span>, <span class="self">self</span>.<span class="number">0</span>)<span class="question-mark">?</span>;
                 Error::fmt_errors(<span class="kw-2">&amp;</span>(<span class="self">self</span>.<span class="number">1</span>).<span class="number">0</span>, f)
             }
         }

         <span class="kw">let </span>input = <span class="kw-2">&amp;</span>[CloneOnly(<span class="string">&quot;x&quot;</span>.to_string()), CloneOnly(<span class="string">&quot;y&quot;</span>.to_string())][..];
         <span class="kw">let </span>result = token(CloneOnly(<span class="string">&quot;z&quot;</span>.to_string()))
             .easy_parse(input)
             .map_err(|e| e.map_position(|p| p.translate_position(input)))
             .map_err(|e| {
                 ExtractedError(
                     e.position,
                     DisplayVec(
                         e.errors
                             .into_iter()
                             .map(|e| e.map_range(|r| DisplayVec(r.to_owned())))
                             .collect(),
                     ),
                 )
             });

         <span class="macro">assert!</span>(result.is_err());
         <span class="comment">// Test that the fresh ExtractedError is Display, so that the internal errors can be
         // inspected by consuming code; and that the ExtractedError can be coerced to StdError.
         </span><span class="kw">let _ </span>= result.map_err(|err| {
             <span class="kw">let </span>s = <span class="macro">format!</span>(<span class="string">&quot;{}&quot;</span>, err);
             <span class="macro">assert!</span>(s.starts_with(<span class="string">&quot;Parse error at 0&quot;</span>));
             <span class="macro">assert!</span>(s.contains(<span class="string">&quot;Expected&quot;</span>));
             <span class="kw">let </span>err: Box&lt;<span class="kw">dyn </span>StdError&gt; = Box::new(err);
             err
         });
     }
 }
 </code></pre></div>
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